I don't know if you know that before you start drawing at all, one crucial thing among many you might need to learn about is some basic anatomy, and the best way coming into my mind to do that - apart from studying pathology, of course - still would be nude art lessions. (If you wonder about that one, just ask several professional and hobby artists )

UPDATE: @Rika-Chicchi: And yes, of course, also the naked and semi-naked statues in the museum, I was going to mention that sooner or later

@Kiryugoji2002: The choice of the drawing utensils probably depends in every case on what you're trying to achieve and/or what suits yourself best.

By the way, did I mention I actually did an internship in a real Animation/SFX studio? One of the reasons I know such things.

Yeah, you have to grasp the human anatomy, as Onuzim Ima said above. As nude models aren't always available, you may use nude statues for practicing drawing.

I tried drawing Petz but it didn't work out.

It's best to practice w/ real persons or statues/pics of them 1st, not w/ anime/manga characters - only when you've already mastered the real ones, you can then handle the artistic distortions in the anime/manga ones well.

Kiryugoji2002 wrote:

I also want to draw action poses for Sailor Moon but I'm not good at perspective.

Perspective is quite theoretical & hence could be a bit boring to some, so I'd suggest to take that later & do drawings 1st.